19/20, fooled by Mattel (and guessed lucky on the other all caps texts). My heuristic was to look at the a, c, e, g, and s, if present in lowercase: are the ends of those characters horizontal (Helvetica) or at an angle (Arial).
A = Angled = Arial
H = Horizontal = Helvetica
Some of the capitals (C, S) have that, too.
Similarly, lowercase r ends vertically in Helvetica, slanted in Arial.
Ultimately, the Helvetica versions "felt right", and that probably contributed to my lucky guesses. A more challenging test would be to compare samples not associated with well-known brands.